Allow spaces in entity names

This line crashes when the line in the file has more than one space, which happens when the name of the entity has spaces.

See https://demo.arkindex.org/process/75c16d58-6210-4a26-b2ec-45ea7efb67f0/0

Exception: The file /tmp/tmp7o9r1wgs-train/test.bio given in input is not in BIO format: check line 598 (1258 B-Date et Lieu